Command Line Interface
4-214
4
spanning-tree loopback-detection release-mode
This command configures the release mode for a port that was placed in the
discarding state because a loopback BPDU was received. Use the
no
form to
restore the default.
Syntax
spanning-tree
loopback-detection release-mode
{
auto
|
manual
}
no spanning-tree
loopback-detection release-mode
•
auto
- Allows a port to automatically be released from the discarding state
when the loopback state ends.
•
manual
- The port can only be released from the discarding state manually.
Default Setting
Auto
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• If the port is configured for automatic loopback release, then the port will only
be returned to the forwarding state if one of the following conditions is
satisfied:
- The port receives any other BPDU except for it’s own, or;
- The port’s link status changes to link down and then link up again, or;
- The port ceases to receive it’s own BPDUs in a forward delay interval.
• If Port Loopback Detection is not enabled and a port receives it’s own BPDU, then
the port will drop the loopback BPDU according to IEEE Standard 802.1W-2001
9.3.4 (Note 1).
• Port Loopback Detection will not be active if Spanning Tree is disabled on the
switch.
• When configured for manual release mode, then a link down / up event will not
release the port from the discarding state.
Example
spanning-tree loopback-detection trap
This command enables SNMP trap notification for Spanning Tree loopback BPDU
detections. Use the
no
form to restore the default.
Syntax
spanning-tree loopback-detection trap
no spanning-tree loopback-detection trap
Default Setting
Disabled
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree loopback-detection release-mode manual
Summary of Contents for 6128PL2
Page 2: ......
Page 8: ...viii ...
Page 26: ...Contents xviii ...
Page 30: ...Tables xxii ...
Page 52: ...Initial Configuration 2 10 2 ...
Page 308: ...Configuring the Switch 3 256 3 ...
Page 473: ...SNMP Commands 4 165 4 ...
Page 644: ...Command Line Interface 4 336 4 ...
Page 648: ...Software Specifications A 4 A ...
Page 663: ......